<template>
  <div
    :class="[prefixCls]"
    v-click-outside="onClickoutside"
    @mouseenter="handleMouseenter"
    @mouseleave="handleMouseleave"
  >
    <div :class="relClasses" ref="reference" @click="handleClick" @contextmenu.prevent="handleRightClick"><slot></slot></div>
    <transition name="transition-drop">
      <Drop
        v-show="currentVisible"
        :prevElRect="prevElRect"
        ref="drop"
        @mouseenter.native="handleMouseenter"
        @mouseleave.native="handleMouseleave">
        <slot name="list"></slot>
      </Drop>
    </transition>
  </div>
</template>
<script>
import Config from '../../config'
import Drop from '../select/dropdown-select.vue'
import {directive as ClickOutside} from 'v-click-outside-x'
import { oneOf, findComponentUpward } from '../../utils/assist'

const prefixCls = `${Config.clsPrefix}dropdown`

export default {
  name: `${Config.namePrefix}Dropdown`,
  directives: { ClickOutside },
  components: { Drop },
  props: {
    trigger: {
      validator (value) {
        return oneOf(value, ['click', 'hover'])
      },
      default: 'hover'
    },
    prevElRect: {
      type: Object
    },
    // placement: {
    //   validator (value) {
    //     return oneOf(value, ['top', 'top-start', 'top-end', 'bottom', 'bottom-start', 'bottom-end', 'left', 'left-start', 'left-end', 'right', 'right-start', 'right-end']);
    //   },
    //   default: 'bottom'
    // },
    visible: {
      type: Boolean,
      default: false
    }
  },
  computed: {
    transition () {
      return ['bottom-start', 'bottom', 'bottom-end'].indexOf(this.placement) > -1 ? 'slide-up' : 'fade'
    },
    relClasses () {
      return [
        `${prefixCls}-rel`,
        {
          [`${prefixCls}-rel-user-select-none`]: this.trigger === 'contextMenu'
        }
      ]
    }
  },
  data () {
    return {
      prefixCls: prefixCls,
      currentVisible: this.visible
    }
  },
  watch: {
    // visible (val) {
    //   console.log(111)
    //   this.currentVisible = val;
    // },
    // currentVisible (val) {
    //   console.log(val)
    //   // if (val) {
    //   //   this.$refs.drop.update();
    //   // } else {
    //   //   this.$refs.drop.destroy();
    //   // }
    //   // this.$emit('on-visible-change', val);
    // }
  },
  methods: {
    handleClick () {
      if (this.trigger === 'custom') return false
      if (this.trigger !== 'click') {
        return false
      }
      this.currentVisible = !this.currentVisible
    },
    handleRightClick () {
      if (this.trigger === 'custom') return false
      if (this.trigger !== 'contextMenu') {
        return false
      }
      this.currentVisible = !this.currentVisible
    },
    handleMouseenter () {
      if (this.trigger === 'custom') return false
      if (this.trigger !== 'hover') {
        return false
      }
      if (this.timeout) clearTimeout(this.timeout)
      this.timeout = setTimeout(() => {
        this.currentVisible = true
      }, 250)
    },
    handleMouseleave () {
      if (this.trigger === 'custom') return false
      if (this.trigger !== 'hover') {
        return false
      }
      if (this.timeout) {
        clearTimeout(this.timeout)
        this.timeout = setTimeout(() => {
          this.currentVisible = false
        }, 150)
      }
    },
    onClickoutside (e) {
      this.handleClose()
      this.handleRightClose()
      if (this.currentVisible) this.$emit('on-clickoutside', e)
    },
    handleClose () {
      if (this.trigger === 'custom') return false
      if (this.trigger !== 'click') {
        return false
      }
      this.currentVisible = false
    },
    handleRightClose () {
      if (this.trigger === 'custom') return false
      if (this.trigger !== 'contextMenu') {
        return false
      }
      this.currentVisible = false
    },
    hasParent () {
      const $parent = findComponentUpward(this, 'Dropdown')
      if ($parent) {
        return $parent
      } else {
        return false
      }
    },
    handleMenuItemClick (command, instance) {
      this.$emit('on-command', command, instance)
    }
  },
  mounted () {
    this.$on('on-click', this.handleMenuItemClick)
    // this.$on('on-click', (key) => {
    //   const $parent = this.hasParent();
    //   if ($parent) $parent.$emit('on-click', key);
    // });
    this.$on('on-hover-click', () => {
      const $parent = this.hasParent()
      if ($parent) {
        this.$nextTick(() => {
          if (this.trigger === 'custom') return false
          this.currentVisible = false
        })
        $parent.$emit('on-hover-click')
      } else {
        this.$nextTick(() => {
          if (this.trigger === 'custom') return false
          this.currentVisible = false
        })
      }
    })
    this.$on('on-haschild-click', () => {
      this.$nextTick(() => {
        if (this.trigger === 'custom') return false
        this.currentVisible = true
      })
      const $parent = this.hasParent()
      if ($parent) $parent.$emit('on-haschild-click')
    })
  }
}
</script>
